Enhanced fatigue crack propagation resistance of Al-Cu-Mg alloy by intensifying Goss texture and refining Goss grains

详细信息    查看全文

• 作者：Fudong Li^a ; ^b ; ^c ; Zhiyi Liu^a ; ^b ; ^{liuzhiyi335@163.com" class="auth_mail" title="E-mail the corresponding author} ; Wenting Wu^a ; ^b ; Peng Xia^a ; ^b ; Puyou Ying^a ; ^b ; Yaru Zhou^a ; ^b ; Wenjuan Liu^a ; ^b ; Luqing Lu^a ; ^b ; An Wang^a ; ^b
• 关键词：Grain orientation ; Grain refinement ; Inclusions ; Fatigue crack propagation ; Al-Cu-Mg alloy
• 刊名：Materials Science & Engineering A
• 出版年：2017
• 出版时间：2 January 2017
• 年：2017
• 卷：679
• 期：Complete
• 页码：204-214
• 全文大小：2617 K

文摘

The effect of intensifying Goss texture and refining Goss grains on the enhancement of fatigue crack propagation (FCP) resistance in an Al-Cu-Mg alloy was systematically investigated. The way to improve fatigue performance mainly includes two steps: intensifying Goss texture component and then refining these Goss grains. Hot rolling at elevated temperature and pre-solution treatment are capable of Goss texture formation. Then large cold rolling reduction can refine grains and obtain more these Goss grains, which increases the twist angle boundary components with their adjacent grains to enhance fatigue crack deflection and FCP resistance. By contrast, refining Brass etc. rolling-oriented grains can increase the tilt angle boundary components and promote fatigue crack growth. And the reason why grain refinement cannot always improve fatigue properties in alloys with micrometer grains can depend mainly on grain orientations and the relative boundary components in this Al-Cu-Mg alloy. Besides, coarse Fe-, Si- and Mn-rich inclusions are detrimental to fatigue properties, but the fine, globular and homogeneous distribution of these particles can improve fatigue properties to some extent.